Key to Hyalopterus apterous viviparae

on primary hosts of Prunus armeniaca, P. domestica, P.dulcis, or P.p e r s i c a

1. Setae on frons stout, approximately half the width of antennal segment II; distance of the bases median dorsal head setae much greater than their lengths (Fig. 6.3A); most tips of median dorsal head setae, meso- and metathoracic seatae, and spinal and pleural setae on abdominal segments I–III apically blunt, almost capitate. Colonizing P. dulcis and P. armeniaca ........................ Hyalopterus amygdali (Blanchard)

- Setae on frons filiform, nearly as long as width of antennal segment II; distance of the bases median dorsal head setae nearly equal to or slightly less than their lengths; thoracic and most dorsal body setae acuminate. Colonizing P. domestica, P. persica, or P. armeniaca .........................................................................2

2. Ratio of length of antennal segment III/ length of cauda 1.8–3.5 (2.5); ratio of length of antennal III/ length antennal segment IV 1.3–1.9 (1.5); ratio of length of hind tibia/ length of cauda 4.6–8.3 (6.1); ratio of length of hind tibia/ length of antennal segment III 2.1– 4.2 (3.5)1 Colonizing P. domestica .................. .................................................................................................................................. Hyalopterus pruni (L.)

- Ratio of length of antennal segment III/ length of cauda 1.3–2.7 (2.0); ratio of length of length of antennal III/ length antennal segment IV 1.0–1.8 (1.4); ratio of length of hind tibia/ length of cauda 3.7–7.6 (5.1); ratio of length of hind tibia/ length of antennal segment III 2.2–3.0 (2.6)1. Colonizing P. p e r s i c a and P. armeniaca ....................................................................................................... Hyalopterus persikonus n.sp.